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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Microstrip patch antenna feed for offset reflector antenna for dual band application
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Microstrip patch antenna feed for offset reflector antenna for dual band application

机译：用于双频应用的偏移反射器天线的微带贴片天线馈送

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摘要

In this article, details of a dual band microstrip patch antenna (MPA) array feed for an offset reflector antenna is presented. The main objective of the proposed structure is to achieve low cross-polarization at Phi = 90 degrees plane in the reflector pattern. Low cross-polar levels in the reflector pattern are achieved by illuminating the reflector with fields of the proposed dual band feed structure. A centered circular array as the dual band feed structure is proposed in which the central radiating element is a dual mode circular MPA operating at 6 GHz and the surrounding circular ring of eight circular MPA elements operating at 4 GHz in the dominant mode. The dual mode central antenna uses the concept of conjugate field matching for cross-polarization reduction. TM21 mode is excited at an appropriate ratio with the TM11 mode to achieve the proper field matching at 6 GHz. The radius of the surrounding circular array is varied to obtain cross-polarization better than -30dB at both the resonant frequencies. The offset reflector gain is found to be better than 37dB with a 2.5 m parabolic reflector and F/D = 0.8 at both the operating frequencies.
机译：在本文中，提出了用于偏移反射器天线的双频微带贴片天线（MPa）阵列馈送的细节。所提出的结构的主要目的是在反射器图案中在PHI = 90度平面下实现低交叉极化。通过用所提出的双频带馈电结构的场照射反射器实现反射器图案中的低横极性。提出了一种作为双频带进料结构的圆形阵列，其中中心辐射元件是以在主导模式下以4GHz操作的八个圆形MPa元件的6 GHz和周围圆环的双模式圆形环。双模式中心天线使用共轭场匹配的概念进行交叉极化减少。 TM21模式以适当的比率与TM11模式振兴，以实现6 GHz的正确场匹配。周围圆形阵列的半径变化，以在谐振频率下获得优于-30dB的交叉极化。发现偏移反射器增益在37dB中具有2.5米抛物杠反射器，并且在操作频率下F / D = 0.8。

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